CN113640724B - Three-phase composite error testing method and system with zero sequence current sensor - Google Patents
Three-phase composite error testing method and system with zero sequence current sensor Download PDFInfo
- Publication number
- CN113640724B CN113640724B CN202110799449.9A CN202110799449A CN113640724B CN 113640724 B CN113640724 B CN 113640724B CN 202110799449 A CN202110799449 A CN 202110799449A CN 113640724 B CN113640724 B CN 113640724B
- Authority
- CN
- China
- Prior art keywords
- phase
- current
- zero sequence
- current sensor
- calibrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 68
- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 150000001875 compounds Chemical class 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000000819 phase cycle Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application discloses a three-phase composite error testing method and system with a zero sequence current sensor. According to typical design parameters of a 10kV alternating current sensor of a power distribution network, determining that rated primary current of the current sensor is 600A, rated primary zero sequence current is 20A, and accurate value coefficient is 10; when the two-phase short circuit is simulated and the composite error is carried out, the current passing through the zero sequence current sensor is far less than 20A when the current is not less than 6000A at one time; and respectively measuring the compound errors of the A phase, the B phase and the C phase of the three-phase current sensor with the zero sequence.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a three-phase composite error testing method and system with a zero sequence current sensor.
Background
When the distribution network fails, the primary short-circuit current is tens of times of rated current, at the moment, the current sensor can accurately provide primary large-current signals for the distribution network terminal, and the composite error accuracy of the current sensor is directly related to whether the relay protection device can act correctly, so that the safety and stability of the distribution network system are affected. Therefore, the composite error performance of the current sensor determines the relay protection reliability of the distribution network terminal.
Three-phase current sensors with zero sequence are generally adopted in the distribution network to measure the current of each phase and the zero sequence current. In the compound error test of the three-phase zero sequence current transformer, the primary current is stably increased to the product of the rated primary current and the accurate value coefficient of the rated protection limit current, and compound error tests are respectively carried out on each phase of the current sensor. According to the general requirement of the accurate value coefficient of the current sensor, when a compound error test is carried out in the distribution network system, the primary current of the current sensor reaches up to kA, and at the moment, the current passing through the zero sequence magnetic flux is overlarge to hundreds of times of the rated primary zero sequence current, so that the saturated sampling resistance current of the zero sequence iron core is overhigh and damaged. If the three-phase rated primary current limit value is applied, a large power source is needed, and the three-phase unbalance is ensured to be small and 1.5%, so that the equipment investment is high.
Disclosure of Invention
The embodiment of the disclosure provides a three-phase composite error testing method and system for a current sensor with zero sequence, which at least solve the technical problem of higher equipment investment caused by adopting a mode of stably increasing primary current to the product of rated primary current and the accurate value coefficient of rated protection limit current to respectively carry out composite error test on each phase of the current sensor in the prior art.
According to one aspect of the disclosed embodiments, there is provided a three-phase composite error testing method with zero sequence current sensor, including: according to typical design parameters of a 10kV alternating current sensor of a power distribution network, determining that rated primary current of the current sensor is 600A, rated primary zero sequence current is 20A, and accurate value coefficient is 10; when the two-phase short circuit is simulated and the composite error is carried out, the current passing through the zero sequence current sensor is far less than 20A when the current is not less than 6000A at one time; and respectively measuring the compound errors of the A phase, the B phase and the C phase of the three-phase current sensor with the zero sequence.
According to another aspect of the embodiments of the present disclosure, there is also provided a three-phase composite error testing system with zero sequence current sensor, including: the parameter determining module is used for determining that rated primary current of the current sensor is 600A, rated primary zero sequence current is 20A and accurate value coefficient is 10 according to typical design parameters of a 10kV alternating current sensor of the power distribution network; the simulation two-phase short circuit module is used for simulating two-phase short circuit, and when the composite error is carried out, the current passing through the zero sequence current sensor is far less than 20A when the current is not less than 6000A; and the measurement composite error module is used for respectively measuring the composite errors of the A phase, the B phase and the C phase of the three-phase current sensor with the zero sequence.
In the invention, the phase sequence measuring method of the composite error of the phase belt zero sequence current sensor simulates the condition of two-phase short circuit, single-phase current is only applied to the primary side and flows in from one phase to the other phase, so that the zero sequence current synthesized by the primary current is approximately zero, and the composite error of each phase is measured at the moment without damaging the sampling resistance of the zero sequence current sensor. And further, the technical problem of high equipment investment caused by adopting a mode of respectively carrying out compound error tests on each phase of the current sensor by stably increasing the primary current to the product of the rated primary current and the accurate value coefficient of the rated protection limit current in the prior art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and do not constitute an undue limitation on the disclosure. In the drawings:
FIG. 1 is a flow chart of a method for testing a composite error of a three-phase current sensor with zero sequence according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a circuit for measuring a combined error of phase A and phase B, according to an embodiment of the present disclosure, from phase A input current, phase B output current;
FIG. 3 is a schematic diagram of a circuit for measuring C-phase composite error from C-phase input current, B-phase output current, according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a three-phase composite error testing system with zero sequence current sensors according to an embodiment of the present disclosure.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
According to a first aspect of the present embodiment, a three-phase with zero sequence current sensor compound error testing method 100 is provided. Referring to fig. 1, the method 100 includes:
s102, determining that rated primary current of a current sensor is 600A, rated primary zero sequence current is 20A and accurate value coefficient is 10 according to typical design parameters of a 10kV alternating current sensor of a power distribution network;
s104, simulating two-phase short circuit, and when the composite error is carried out, when the current is not less than 6000A, the current passing through the zero sequence current sensor is far less than 20A;
s106, respectively measuring the composite errors of the A phase, the B phase and the C phase of the three-phase sensor with the zero sequence current.
Specifically, the three-phase instrument for testing the composite error of the zero sequence current sensor comprises a single-phase current source, a current booster, a standard current transformer and a composite error checking instrument. The single-phase current source can provide a single-phase current of 30A-1200A, and the primary current can be increased to the target current through the current booster.
According to typical design parameters of a 10kV alternating current sensor of a power distribution network, rated primary current of the current sensor is 600A, rated primary zero-sequence current is 20A, an accurate value coefficient is 10, when a composite error is carried out, when a current of not less than 6000A is fed in at one time under the condition of simulating a two-phase short circuit, the current passing through the zero-sequence current sensor is far less than 20A, sampling resistance of the zero-sequence current sensor cannot be damaged, and at the moment, the composite errors of A phase, B phase and C phase of the three-phase band zero-sequence current sensor are respectively measured.
Referring to fig. 2 and 3, taking the measurement of a phase composite error as an example, the primary loop is that the phase A is communicated with a current not smaller than 6000A, the current flows out from the phase B, at the moment, the synthesized zero sequence current passing through the zero sequence current sensor is very small, the secondary terminal of the phase A sensor and the phase A are connected into the composite error checking instrument in a standard way, and the composite error of the phase A is measured. When the B-phase composite error is measured, the primary side wiring is unchanged, and the phase sequence of the standard terminal connected with the composite error checking instrument is only required to be replaced, and the B-phase secondary terminal is connected with the composite error checking instrument. When the composite error of the C phase is measured, the test current which is not less than 6000A is introduced from the C phase at one time, and flows out from the B phase, the C phase is connected with the standard input terminal of the calibrator, the B phase is connected with the secondary output terminal of the calibrator, and the secondary end of the C phase is connected with the composite error calibrator, so that the composite error of the C phase is measured.
Therefore, the phase sequence measuring method of the phase belt zero sequence current sensor compound error simulates the condition of two-phase short circuit, single-phase current is only applied to the primary side and flows in from one phase to the other phase, so that the zero sequence current synthesized by the primary current is approximately zero, and the compound error of each phase is measured at the moment, and the sampling resistance of the zero sequence current sensor is not damaged. And further, the technical problem of high equipment investment caused by adopting a mode of respectively carrying out compound error tests on each phase of the current sensor by stably increasing the primary current to the product of the rated primary current and the accurate value coefficient of the rated protection limit current in the prior art is solved.
Optionally, measuring the composite error of the a phase of the three-phase current sensor with zero sequence includes: and (3) introducing test current from the primary side of the phase A, flowing out the phase B, and not introducing current to the phase C, wherein the phase A is connected with a standard input terminal of the calibrator, the phase B is connected with a standard output terminal of the calibrator, and the phase A secondary output is connected with the compound error calibrator to measure the compound error of the phase A.
Optionally, measuring the composite error of the B phase of the three-phase current sensor with zero sequence includes: the primary side wiring is unchanged, test current is led in from the primary side of the phase A, the phase B flows out, the phase C does not flow in, the input and output connectors of the standard part of the secondary side access calibrator are exchanged, the phase A standard is connected with the standard output terminal of the calibrator, the phase B standard is connected with the standard input terminal of the calibrator, the secondary output of the phase B is connected with the composite error calibrator, and the composite error of the phase B is measured.
Optionally, measuring the composite error of the C-phase of the three-phase current sensor with zero sequence includes: and the test current is introduced from the C phase once, flows out from the B phase, the C phase standard is connected with a standard input terminal of the calibrator, the B phase standard is connected with a secondary output terminal of the calibrator, and the C phase secondary is connected with a composite error calibrator to measure the composite error of the C phase.
Therefore, the phase sequence measuring method of the phase belt zero sequence current sensor compound error simulates the condition of two-phase short circuit, single-phase current is only applied to the primary side and flows in from one phase to the other phase, so that the zero sequence current synthesized by the primary current is approximately zero, and the compound error of each phase is measured at the moment, and the sampling resistance of the zero sequence current sensor is not damaged. And further, the technical problem of high equipment investment caused by adopting a mode of respectively carrying out compound error tests on each phase of the current sensor by stably increasing the primary current to the product of the rated primary current and the accurate value coefficient of the rated protection limit current in the prior art is solved.
In accordance with another aspect of the present embodiment, a three-phase current sensor with zero sequence compound error test system 400 is also provided. The system 400 includes: the parameter determining module 410 is configured to determine that the rated primary current of the current sensor is 600A, the rated primary zero sequence current is 20A, and the accurate value coefficient is 10 according to typical design parameters of a 10kV ac sensor of the power distribution network; the simulated two-phase short circuit module 420 is configured to simulate a two-phase short circuit, and when the composite error is performed, the current passing through the zero sequence current sensor is far less than 20A when the current is not less than 6000A; and the measurement composite error module 430 is used for respectively measuring the composite errors of the A phase, the B phase and the C phase of the three-phase current sensor with the zero sequence.
Optionally, the measurement composite error module 430 includes: and the measurement A phase composite error submodule is used for introducing test current from the primary side of the A phase, flowing out the B phase, and not introducing current to the C phase, wherein the A phase standard is connected with a standard input terminal of the calibrator, the B phase standard is connected with a standard output terminal of the calibrator, and the A phase secondary output is connected with the composite error calibrator to measure the composite error of the A phase.
Optionally, the measurement composite error module 430 includes: the B phase composite error measuring sub-module is used for leading in test current from the primary side of the A phase, leading out the B phase, leading out no current from the C phase, exchanging input and output connectors of the standard part of the secondary side access calibrator, connecting the standard output terminal of the A phase standard access calibrator, connecting the standard input terminal of the B phase standard access calibrator, connecting the secondary output of the B phase to the composite error calibrator, and measuring the composite error of the B phase.
Optionally, the measurement composite error module 430 includes: the C phase composite error measuring sub-module is used for introducing test current from the C phase at one time, flowing out from the B phase, connecting the C phase standard to the standard input terminal of the calibrator, connecting the B phase standard to the secondary output terminal of the calibrator, connecting the C phase secondary to the composite error calibrator, and measuring the composite error of the C phase.
The system 400 for testing the composite error of the three-phase current sensor with zero sequence according to the embodiment of the present invention corresponds to the method 100 for testing the composite error of the three-phase current sensor with zero sequence according to another embodiment of the present invention, and will not be described herein.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The solutions in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java, and an transliterated scripting language JavaScript, etc.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (1)
1. The method for testing the composite error of the three-phase current sensor with the zero sequence is characterized by comprising the following steps of:
according to typical design parameters of a 10kV alternating current sensor of a power distribution network, determining that rated primary current of the current sensor is 600A, rated primary zero sequence current is 20A, and accurate value coefficient is 10;
when the two-phase short circuit is simulated and the composite error is carried out, the current passing through the zero sequence current sensor is far less than 20A when the current is not less than 6000A at one time;
respectively measuring the compound errors of the A phase, the B phase and the C phase of the three-phase sensor with the zero sequence current;
measuring a composite error of a phase of a three-phase band zero sequence current sensor, comprising:
the test current is led in from the primary side of the A phase, the B phase flows out, the C phase does not flow in, the A phase standard is connected to the standard input terminal of the calibrator, the B phase standard is connected to the standard output terminal of the calibrator, the A phase secondary output is connected to the compound error calibrator, and the compound error of the A phase is measured;
measuring a composite error of a B phase of a three-phase strip zero sequence current sensor, comprising:
the primary side wiring is unchanged, test current is led in from the primary side of the phase A, the phase B flows out, the phase C does not flow in, the input and output connectors of the standard part of the secondary side access calibrator are exchanged, the standard output terminal of the phase A is connected with the standard output terminal of the calibrator, the standard input terminal of the phase B is connected with the standard input terminal of the calibrator, the secondary output of the phase B is connected with the composite error calibrator, and the composite error of the phase B is measured;
measuring a composite error of a C-phase of a three-phase strip zero sequence current sensor, comprising:
and the test current is introduced from the C phase once, flows out from the B phase, the C phase standard is connected with a standard input terminal of the calibrator, the B phase standard is connected with a secondary output terminal of the calibrator, and the C phase secondary is connected with a composite error calibrator to measure the composite error of the C phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110799449.9A CN113640724B (en) | 2021-07-15 | 2021-07-15 | Three-phase composite error testing method and system with zero sequence current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110799449.9A CN113640724B (en) | 2021-07-15 | 2021-07-15 | Three-phase composite error testing method and system with zero sequence current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113640724A CN113640724A (en) | 2021-11-12 |
| CN113640724B true CN113640724B (en) | 2024-01-12 |
Family
ID=78417342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110799449.9A Active CN113640724B (en) | 2021-07-15 | 2021-07-15 | Three-phase composite error testing method and system with zero sequence current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113640724B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301121A (en) * | 1991-07-11 | 1994-04-05 | General Electric Company | Measuring electrical parameters of power line operation, using a digital computer |
| CN108446441A (en) * | 2018-02-11 | 2018-08-24 | 中国电力科学研究院有限公司 | A kind of analogue system for analog current mutual inductor short trouble |
| CN109490813A (en) * | 2018-12-06 | 2019-03-19 | 国网四川省电力公司电力科学研究院 | A kind of current transformer characteristic appraisal procedure and system |
| CN112068063A (en) * | 2020-09-15 | 2020-12-11 | 国电大渡河深溪沟水电有限公司 | Optical current transformer test system and test method |
| CN113093083A (en) * | 2021-03-24 | 2021-07-09 | 中国电力科学研究院有限公司 | Method and system for testing transient performance of current transformer for direct-current engineering direct-current field |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160276969A1 (en) * | 2015-03-20 | 2016-09-22 | Delphi Technologies, Inc. | Electric motor driver with current sensor error correction |
-
2021
- 2021-07-15 CN CN202110799449.9A patent/CN113640724B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301121A (en) * | 1991-07-11 | 1994-04-05 | General Electric Company | Measuring electrical parameters of power line operation, using a digital computer |
| CN108446441A (en) * | 2018-02-11 | 2018-08-24 | 中国电力科学研究院有限公司 | A kind of analogue system for analog current mutual inductor short trouble |
| CN109490813A (en) * | 2018-12-06 | 2019-03-19 | 国网四川省电力公司电力科学研究院 | A kind of current transformer characteristic appraisal procedure and system |
| CN112068063A (en) * | 2020-09-15 | 2020-12-11 | 国电大渡河深溪沟水电有限公司 | Optical current transformer test system and test method |
| CN113093083A (en) * | 2021-03-24 | 2021-07-09 | 中国电力科学研究院有限公司 | Method and system for testing transient performance of current transformer for direct-current engineering direct-current field |
Non-Patent Citations (4)
| Title |
|---|
| calculation method of composite error for electronic current transformers based on rowgowski coil;liu bin;《High voltage engineering》;第2391-2397页 * |
| 杨桂平.《电力电容器与无功补偿》.2019,1-6页. * |
| 继保专用电流互感器特性参数的认识与分析;袁起;《广东水利电力职业技术学院学报》;1-5页 * |
| 适用高寒地区电子式互感器校准系统的研究与实现;毛安澜;《高压电器》;1-8 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113640724A (en) | 2021-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111141995B (en) | Line double-end steady-state distance measuring method and system based on amplitude comparison principle | |
| KR101798689B1 (en) | Power device including current transformer and method for compensating of current trnasformer | |
| CN113447878A (en) | Error measuring equipment and method for current transformer | |
| CN113625215B (en) | Voltage transformer abnormity calibration method and device based on sectional test | |
| EP2378296B1 (en) | Method and arrangement for determining impedance values | |
| CN113640724B (en) | Three-phase composite error testing method and system with zero sequence current sensor | |
| CN111090072B (en) | CT loop wireless automatic checking device and checking method | |
| CN105353332B (en) | Method and system for checking long-term electrification performance of electronic transformer | |
| Normandeau et al. | Evaluation of low-power instrument transformers for generator differential protection | |
| CN115902755B (en) | Alarm parameter testing method for all-fiber current transformer | |
| US8838402B2 (en) | Method and arrangement for voltage measurement | |
| CN104133133A (en) | Standardized test system of relay protection test room | |
| CN108152782B (en) | Method for testing correction coefficient of high-supply high-count electric energy meter | |
| CN111693924B (en) | System and method for detecting monitoring performance of voltage transformer on-line monitoring device | |
| CN109856583A (en) | A kind of measuring device and method of electronic current mutual inductor progress of disease delay | |
| CN110082703A (en) | A kind of power distribution network metering device second loop return wiring detection method and device | |
| CN112415287A (en) | Method and system for identifying transformation ratio replacement of metering current transformer | |
| CN215953833U (en) | Current transformer's primary winding leakage current compensating circuit and check-up equipment | |
| CN114264901A (en) | Balance current simulation method and related device during transformer out-of-area fault | |
| Nițu et al. | Predetermining the size of inrush current in power transformers coupling using LabVIEW | |
| CN113702709B (en) | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer | |
| Chandrasekar et al. | Optimal Design, Re-engineering and Testing of a 50: 5A Current Transformer for Medium Voltage Industrial Requirements | |
| CN115856751A (en) | Device and method for testing response consistency of alternating current/direct current transformer | |
| CN112858986A (en) | Current transformer's primary winding leakage current compensating circuit and check-up equipment | |
| Martin | Impedance Based Protection for Fuseless Shunt Capacitor Banks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Mu Xiaojing Inventor after: Wan Defeng Inventor after: Huang Yongxi Inventor after: Liu Xichao Inventor after: Yang Fan Inventor after: Xiong Junjun Inventor after: Wan Gang Inventor after: Liu Bin Inventor after: Huang Hua Inventor after: Liu Yong Inventor after: Deng Xiaopin Inventor after: Wang Xiaozhou Inventor after: Feng Xiangxiang Inventor before: Mu Xiaojing Inventor before: Wan Defeng Inventor before: Huang Yongxi Inventor before: Liu Xichao Inventor before: Yang Fan Inventor before: Xiong Junjun Inventor before: Wan Gang Inventor before: Liu Bin Inventor before: Huang Hua Inventor before: Liu Yong Inventor before: Deng Xiaopin Inventor before: Wang Xiaozhou Inventor before: Feng Xiangxiang |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |